Why doesn't the Simulation Library Compiler see my Mentor Graphics Questasim installation as valid?

Description

Due to a problem in the Quartus® II software version 11.1, the Simulation Library Compiler GUI may not see Mentor Graphics® Questasim® installations as valid when specified in the Executable Location field.

Resolution

To work around this problem in the Quartus® II software version 11.1, the command line version of the Simulation Library Compiler can be used as follows:

quartus_sh(.exe) --simlib_comp -family all -tool questasim -language <vhdl/Verilog> -tool_path <path>

For example:

quartus_sh.exe --simlib_comp -family all -tool questasim -language vhdl -tool_path C:\questasim64_10.0c\win64

This problem is fixed beginning with the Quartus II software version 12.0.